15 Questions | Total Attempts: 65  Settings  How much do you know about the pressure, volume, and density of gases? Are you aware of the gas laws? How much do you know about them? Can you solve some mathematical equations? This is a quiz to help prepare for the gases portion of the exam, or simply help you enhance your knowledge.

• 1.
You have two 1 liter containers of NH3 gas at STP.  You double the temperature (in Kelvin) in the first container and the second container remains at STP.  What is the ratio of the pressures from the first container to the second?
• A.

1:1

• B.

2:1

• C.

1:2

• D.

4:1

• E.

1:4

• 2.
A balloon is filled to a volume of 5.0 liters at a temperature of 25 C.  The balloon is then cooled to 0.0 C.  Assuming pressure is constant, what is the change in volume of the balloon?
• A.

4.6 liters

• B.

-0.2 liters

• C.

0.4 liters

• D.

-0.4 liters

• E.

0.2 liters

• 3.
You have three 1.0 liter containers of gas at 25 C and 750 torr. The first container has NH3, the second has NO2 and the third has HCl.  Which container has the most molecules?
• A.

First container

• B.

Second container

• C.

Third container

• D.

All the same.

• E.

First and second are the same, the third flask has less.

• 4.
You have a balloon at 1.02 atm and 25 C.  You heat the balloon to 52 C and the volume increases from 2.0 liters to 3.34 liters.  What is the new pressure of the gas in the balloon?
• A.

0.67 atm

• B.

1.27 atm

• C.

2.22 atm

• D.

1.12 atm

• E.

None of these

• 5.
You have a sample of gas that has a mass of 4.45g.  It fills a container with a volume of 2.34 liters at STP.  What is the density of the gas?
• A.

0.525 g / liter

• B.

2.15 g / liter

• C.

22.4 g / liter

• D.

1.90 g / liter

• E.

You need to know what type of gas in order to answer the question.

• 6.
You have three containers of gas with a valve between the three.  When the valve is opened, all three containers have a volume of 20.0 liters.  The first container has 12.4 g of Hydrogen, the second container has 8.5 g of Helium and the third has 10.4 g of Oxygen.  All three containers are held at 25 C.  What is the final pressure in the combined container when the valves are opened?
• A.

38.3 atm

• B.

0.881 atm

• C.

18.4 atm

• D.

18.0 atm

• E.

None of these.

• 7.
You have a sample of NH3 gas and you double the temperature from 25 C to 50 C.  What happens to the average kinetic energy of the gas?
• A.

It doubles.

• B.

It increases

• C.

It decreases

• D.

It would half the original value

• E.

Two of these are true.

• 8.
You have two gases in one 5.0 liter container.  One of the gases is helium and the other is hydrogen.  The pressure in the container is 780 torr and the temperature is 25 C.  Both gases are then allowed to effuse from the container through a pinhole.  What is the rate of effusion of hydrogen to helium?
• A.

1.41 : 1 Hydrogen is faster

• B.

1.41 : 1 Helium is faster

• C.

2.0 : 1 Hydrogen is faster

• D.

2.0 : 1 Helium is faster

• E.

They are the same. Identities of the gases do not matter.

• 9.
What are the conditions that allow gases to behave most like a real gas?
• A.

High pressure, high temperature and high molar mass

• B.

Low pressure, low temperature and low molar mass

• C.

Polar molecules with low mass at high pressure, and high temperature

• D.

It depends on the size of the gas molecule

• E.

None of these.

• 10.
A sample of oxygen gas has a volume of 1.91 L at 27Ã�Â°C and 800.0 torr. How many oxygen molecules does it contain?
• A.

4.92 x 10^22

• B.

3.74 x 10^23

• C.

5.46 x 10^23

• D.

7.37 x 10^24

• E.

None of these

• 11.
You are holding two balloons, an orange balloon and a blue balloon.  The orange balloon is filled with neon (Ne) gas and the blue balloon is filled with argon (Ar) gas.  The orange balloon has twice the volume of the blue balloon.  Which of the following best represents the mass ratio of Ne:Ar in the balloons?
• A.

1:1

• B.

1:2

• C.

2:1

• D.

1:3

• E.

3:1

• 12.
You have a 5.0 liter container that has a total of three different gases in it.  You have 20.% Oxygen, 20.% Hydrogen and 60.% Argon by mass.  The container is under 2.0 atm pressure and held at 32 C.  If you heat the container to 50. C, what will be the total pressure in the container?
• A.

4.2 atm

• B.

1.4 atm

• C.

3.1 atm

• D.

2.1 atm

• E.

None of these

• 13.
A sample of gas is in a 50.0-mL container at a pressure of 645 torr and a temperature of 25Ã�Â°C. The entire sample is heated to a temperature of 35Ã�Â°C and transferred to a new container whose volume is 80.4 mL. The pressure of the gas in the second container is:
• A.

562 torr

• B.

388 torr

• C.

1.07 x 10^3 torr

• D.

142 torr

• E.

415 torr

• 14.
It is found that 250. mL of a gas at STP has a mass of 1.81 g. What is the molar mass?
• A.

162 g/mol

• B.

7.24 g/mol

• C.

11.2 g/mol

• D.

22.4 g/mol

• E.

49.5 g/mol

• 15.
Calculate the density of nitrogen at STP.
• A.

0.0312 g/l

• B.

0.625 g/l

• C.

0.800 g/l

• D.

1.25 g/l

• E.

1.60 g/l

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